Method and apparatus for screening

ABSTRACT

A method and apparatus for screening faces of a substantially rectangular equipment. The apparatus having a frame structure including a plurality of screen support frames disposed around the equipment, each face having edge screen support frames laterally spaced horizontally between two vertical edges of each face such that a corner of the equipment includes edge screen support frames disposed in perpendicular relationship secured thereto, a plurality of movable screen cover panels and stationary screen cover panels supported within the screen support frame, the movable screen cover panels being slidably moved to substantially overlap the stationary cover panels to substantially expose the faces of the equipment.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to screening devices, moreparticularly it relates to a method and apparatus for screening the viewof outdoor equipment.

[0003] 2. Description of the Prior Art

[0004] Large equipment, such as high voltage air conditioning units,heating, and ventilating equipment are often placed on top of buildingsto increase the interior volume without increasing the overall height ofthe structure. However, this arrangement can be unsightly and thus it isnecessary or desirable to improve its appearance and make itaesthetically pleasing, especially in public spaces some form ofscreening apparatus is used but generally, the screening apparatus forlarge equipment can be difficult and time consuming to install or removewhen it is necessary to make repairs or adjustments.

[0005] Several solutions have been proposed by the prior art, forexample, U.S. Pat. No. 5,664,384, describes a device which provides acover for large outdoor equipment, such as ventilation equipment. Thecover panels used within the device have to be removed from the framebefore workers may gain access to the equipment for repair. Thisintroduces a safety hazard when working at elevated locations. Inanother embodiment, the entire frame may be flipped up, in a similarmanner to a hood of a car being opened, so that a worker may gain accessto the equipment. Again, however, this restricts access and exposes alarge surface area to wind and the like.

[0006] None of the prior art appears to show a screening devicesupported by outriggers as to be spaced from the unit with panels thatare slidable along tracks to permit access to the unit.

SUMMARY OF THE INVENTION

[0007] A screening device for screening roof mounted equipment and thedevice having a frame structure to extend across at least one face ofthe equipment. A pair of support frames laterally placed along the oneface and extending between the equipment and the frame to support theframe in spaced relationship from the equipment. A plurality of panelslocated on the frame, at least one of the panels being slidable relativeto the frame between a first position in which a portion of the face iscovered and a second position in which the portion of the face isexposed.

[0008] A screening device for screening roof mounted equipmentcomprising a frame having a plurality of panels with at least one of thepanels moveable from a position in which a portion of a face of theequipment is covered to a position in which it is uncovered. A pair ofsupport frames for supporting the frame is spaced in relationship fromthe face of the equipment. Each of the support frames being fasteneddirectly to the equipment so as to cantilever the frame therefrom.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] These and other features of the preferred embodiments of theinvention will become more apparent in the following detaileddescription in which reference is made to the appended drawings wherein:

[0010]FIG. 1 shows a screen in use with an equipment;

[0011]FIG. 2 is a section view along II-II of FIG. 1;

[0012]FIG. 3 is a schematic representation of the placement of supportframes on the equipment shown on FIG. 1;

[0013]FIG. 4 is a perspective view of the placement of tracks on thesupport frames of FIG. 3;

[0014]FIG. 5 is an exploded view of the engagement of a upper screenrack with a cantilever arm of the screen support frame; and

[0015]FIG. 6 is an exploded view, showing attachment of a portion of thescreen to the tracks of FIG. 4 of the slidable engagement between tracksand the screen cover panel;

[0016]FIG. 7 is an enlargement view similar to FIG. 6 exploded view of atongue and groove configuration between rails and guides;

[0017]FIG. 8 is an exploded view of the interconnection of rail memberswith support members;

[0018]FIG. 9 shows positioning of a corner cap and a top cap; and

[0019]FIG. 10 shows positioning of a corner angle/gap cover.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Reference is first made to FIG. 1 of the drawings representing ascreening device 10 secured to equipment 12, such as a high voltage airconditioning unit and having external faces 11. Generally, the equipment12 is located on top of a roof 13 of a building. The screening device 10includes a frame structure 14 having a plurality of screen cover panels16 disposed therein. The screen cover panels 16 serve to screen theequipment 12, and are disposed a predetermined distance from theequipment 12 sufficient to permit access to the equipment. The panels 16are either moveable panels 16 a, fixed comer panels 16 b are fixedintermediate panels 16 c whose position is determined by the nature ofthe equipment being screened.

[0021] Referring to FIG. 2, the frame structure 14 is cantilevered fromthe equipment 12 by a plurality of screen support frames 18 disposedaround the equipment 12. A screen support frame 18 a is disposed at eachcorner and an intermediate screen support frames 18 b disposed betweenthe edge screen support frames 18 a, if required. Each screen supportframe 18 includes an upper cantilever arm 20 and a lower cantilever arm22 arranged substantially parallel to one another. An inner column 24 issecured between the inner ends of upper cantilever arm 20 the lowercantilever arm 22 and is adapted for attachment to the equipment 12. Anouter column 26 extends between the outer ends of the upper cantileveredarm 20 and the lower cantilevered arm 22 parallel to the inner column24. A portion of the cantilever arms 20, 22 projects beyond the outercolumn 26 to define an upper lip 27 and a lower lip 29. The screensupport frame 18 also includes a bracing member 28 disposed diagonallybetween the first cantilever arm 20 and the second cantilever arm 22.The bracing member 28 conveniently is secured to each of the arms 20, 22as the attachment of the columns 24, 26. Typically, the cantilever arms20,22, the inner and outer columns 24, 26, and the bracing member 28 areformed as hollow tubes having a generally rectangular cross section.

[0022] The inner column 24, the outer column 26, the bracing member 28,and the cantilever arms 20, 22 are held together by fasteners 30, suchas nuts and bolts, welding, rivets and so on. The screen support frames18 are preassembled, although the fasteners 30 may be loose to assist inalignment during installation. The inner column 24 is bolted to an outersurface of the equipment 12 so as to be held above the surface of theroot and avoid penetration of the root. The frame 14 is thuscantilevered from the equipment 12 and maintained elevated from theroot.

[0023] Referring to FIGS. 3, 4, 5, 6 and 7, the frame structures 14 aresupported between the upper lip 27 and the lower lip 29 to maintain thepanels 16 to the distance of the cantilever arms 20, 22 from theequipment 12 at predetermined distances around the equipment 12. Theplurality of screen cover panels 16 are appropriately arranged to shieldthe equipment 12, while at the same time providing a screen 10 which hasdesirable aesthetics.

[0024] The screen cover panels 16 are supported by an upper track 32 andlower track 38 of the frame structure 14. Each of the tracks 32, 38 hasan inner rail 40 and an outer rail 42 secured thereto. Each of thetracks 32, 38 is formed from a reentrant channel member 33 with a base35 and sidewalls 37. End walls 39 extend from the sidewalls 37 parallelto the base 35. The rails 40, 42 are secured to the base 35 opposite tothe walls 37 and each are square in cross section.

[0025] The upper track 32 and the lower track are secured to the upperlip 27 and the lower lip 29 of the support frames structuresrespectively by apertures 43 in the side walls 37 and between the endwalls 39 and up. The upper track 32 and the lower track 38 extendlongitudinally between edge screen support frames 18 a, and extendsubstantially beyond both edge screen support frames 18 a such that aportion of the upper track 32 and the lower track 38 at either endextends laterally beyond the face 11 of the equipment 12. The tracks 32,38 can be joined end to end to increase the length of the frame 14 by ajoiner plate 52 connected between the pair of tracks 32, 38, as shown inFIG. 8. The plate 52 is generally planar and has a pair of upstandingtags 53. The tags 53 are spaced apart to receive the outer end of thearms 22, 24 of a frame 18 positioned at the connection of the tracks.The plate 52 is dimensioned to slide into the base and secured with tags55 engaging in the apertures in the plate 52. The sidewalls 35 of uppertrack 32 and the lower track 38 include apertures 43 to accommodate theupper lip 27 and the lower lip 29, such that the each tracks issupported on a respective one of the upper lip 27 or lower lip 29. Theapertures 43 are dimensioned such that the lips 27, 29 are held snuglywithin the lips 27, 29 and may be secured by a screw or bolt. The tracks32, 38 are thus separated in vertical alignment with the rails 34, 36facing one another

[0026] The inner rails 34, 40 are generally smaller in dimension thanthe outer rails 36, 42 and the rails are spaced from each other toprovide a slot in order to accommodate the screen cover panels 16.

[0027] The screen cover panels 16 include U-shaped channels guides 44disposed lengthwise on an upper edge 46 and a lower edge 48 of the outerframe 43. The U-shaped channels 44 are dimensioned too slidably engageeither the outer rails 36, 42,or the inner rails 23, 40 to allowdisplacement of the screen cover panel 16 along the tracks 32, 38. Thescreen cover panels 16 are assembled within the frame structure 14 bysliding the screen cover panels 16 between the tracks 32, 38, such thatthe U-shaped channels 44 fit around respective ones of the rails 34, 36,40 and 42. Where the screen cover panels 16 a are to be moveable theyare supported on smaller inner rails 34, 40, while the stationary screencover panels 16 b are disposed on outer rails 36, 42 with a closer fitand fastened in situ by a screw 30.

[0028] The arrangement of sliding and fixed panels is determined by thenature of the equipment being shielded. Sliding panels are installedwhere access is required and stationary panels installed at otherlocations to add rigidity. As can be seen in FIG. 2, intermediatestationary screen cover panels 16 c are located between the edgestationary screen cover panels 16 b, depending on the dimensions of theequipment 12. The stationary screen cover panels 16 b are generallylocated at comers 12 a, 12 b, 12 c, 12 d of the frame structure 14 andare fastened to the upper track 32 and lower track 38, such so as to addrigidity to the overall frame structure 14. However, stationary panelsmay be inserted between the ends as shown at 16 c.

[0029] Referring now to FIG. 9, a top cap is secured on top of the uppertrack 32 by a fastener 30. Generally, the top cap 54 is dimensioned tofit upper track 32 and extend the longitudinal length of the upper track32. The top cap 54 can be joined or cut to match the length of the uppertrack 32. The stationary screen cover panels 16 b that are adjacent oneanother are covered by an angle cap 56 to cover the adjacent edges andprevent removal of the sliding panels 16 a.

[0030] In use, the sliding panels 16 a are slidable along the innertracks to expose selected locations of the equipment. The panels 16 aare retained securely in the tracks while being slidable to provideaccess. A uniform aesthetic appearance is provided to the exterior.

[0031] Reference is now made to FIG. 2 and FIGS. 1, 3-10, in order todescribe a method of assembly of the screen device 10.

[0032] Initially the site is prepared for installation by takingmeasurements of the faces 11 of the equipment 12 to determine the numberof screen support frames 18 are needed for placement around theequipment 12 and the placement of the fixed and sliding panels.

[0033] The screen support frames 18 are positioned and secured at eachcomer 12 a, 12 b, 12 c, 12 d of the generally rectangular equipment 12,such that each face 11 of the equipment 12 has at least two screensupport frames 18 laterally spaced horizontally between the two verticaledges 11 a, 11 b of the faces 11.

[0034] When intermediate screen support frames 18 b are needed dependingon the dimensions of the equipment face 11 they are attached atappropriate locations that permit attachments on the equipment.

[0035] If longer tracks are needed, a joiner plate 52 is inserted into apair of tracks 32, 38 in order to lengthen the tracks 32, 38 toaccommodate the dimensions of the equipment 12. The joiner plate 52 isfastened to the upper lip 27 and lower lip 29 of an intermediate screensupport frame 18.

[0036] The upper track 32 is slid into the upper lip 27 of screensupport frames 18, by aligning the apertures 43 defined in the uppertrack 32 with upper lip 27 of the screen support frames 18.

[0037] Similarly, the lower track 38 is slid into the lower lip 29 ofscreen support frames 18, by aligning the apertures 43 defined in thelower track 38 with lower lip 29 of the screen support frames 18.

[0038] The upper track 32 and lower track 38 are secured onto lips 27,29, respectively, with a fastener 30.

[0039] The movable screen cover panels 16 a are slid between the tracks36, 38 such that the U-shaped channels 44 pass to either side of theinner rails 34, 40.

[0040] The stationary screen cover panels 16 b are slid between thetracks 38 such that the U-shaped channels 44.

[0041] The stationary screens 16 are located at the selected locationssuch as comers 12 a, 12 b, 12 c, 12 d of the frame structure 14 andfastened to the upper track 32 and lower track 38, such so as to addrigidity to the overall frame structure 14. The stationary screen coverpanels 16 b are outside the footprint of the equipment face 11 and sodisposed to allow access to the equipment face 11. The moveable screencover panels 16 a are slidable along the tracks as to be able to overlapthe stationary screen cover panels 16 b.

[0042] A top cap 54 is positioned and secured on the upper track 32 anda comer cap 55 secured at an intersection of the top caps 54, and acomer angle/gap cover 58 is then attached between perpendicularstationary screen cover panels 18 at corners 12 a, 12 b, 12 c, 12 d.

[0043] In an example of a screening device 10 installation, the innersurface of the frame structure 14 is approximately 18 inches from theequipment 12, and the thickness of the fame is approximately 4 inches.Thus this gap between the screen cover panels 16 and the equipment 12allows for installation of input or output services to the equipment 12,such as, gas lines, water/waste discharge pipes or power utility boxes.

[0044] In yet another embodiment, there is provided only one rail 34, 40for the slidable motion of the movable screen cover panels 16 a, whilethe stationary screen cover panels 18 are fixedly secured to the screenframe structure 18 and do not rest on any rail.

[0045] Although the invention has been described with reference tocertain specific embodiments, various modifications thereof will beapparent to those skilled in the art without departing from the spiritand scope of the invention as outlined in the claims appended hereto.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
 1. A screening device for screening roof mounted equipment, said device having a frame structure to extend across at least one face of said equipment, a pair of support frames laterally placed along said one face and extending between said equipment and said frame to support said frame in spaced relationship from said equipment, a plurality of panels located on said frame, at least one of said panels being slidable relative to said frame between a first position in which a portion of said face is covered and a second position in which said portion of said face is exposed.
 2. A screening device according to claim 1 in which another of said panels is secured to said frame to inhibit relative movement there between.
 3. A screening device according to claim 2 wherein said frame includes an upper track and a lower track and said one panel is slidable on rails on each of said tracks.
 4. A screening device according to claim 3 wherein said support frames include upper and lower frame members engaged with said upper and lower tracks respectively to provide support therefore.
 5. A screening device according to claim 4 wherein distal ends of said upper and lower frame members are received in apertures in said tracks.
 6. A screening device according to claim 4 wherein said upper and lower frame members are maintained in spaced relationship by a pair of columns.
 7. A screening device according to claim 6 wherein one of said columns is secured to said face of said equipment.
 8. A screening device according to claim 7 wherein distal ends of said upper and lower frame members extend beyond the other of columns and are received in apertures in said track.
 9. A screening device according to claim 8 wherein a brace extends between said upper and lower frame members.
 10. A screening device according to claim 3 wherein each of said tracks includes a pair of rails arranged side by side and said panels are mounted on different ones of said rails to permit said one panel to slide past the other of said panels.
 11. A screening device according to claim 10 wherein said one panel is located on a rail closest to said equipment.
 12. A screening device according to claim 2 wherein said other of said panels is located at one end of said frame.
 13. A screening device according to claim 3 wherein said tracks are formed from a pair of track members connected end to end by a bracket and a further support frame is located at the connection to provide support for said bracket.
 14. A screening device according to claim 13 wherein said bracket includes a pair of upstanding flanges for engagement with upper and lower frame members of said support frame.
 15. A screening device for screening roof mounted equipment comprising a frame having a plurality of panels with at least one of said panels moveable from a position in which a portion of a face of said equipment is covered to a position in which it is uncovered, a pair of support frames for supporting said frame is spaced relationship from said face of said equipment, each of said support frames being fastened directly to said equipment so as to cantilever said frame therefrom.
 16. A screening device according to claim 15 in which each of said support frames includes a pair of vertical columns, one of said columns being secured to a vertical surface of said equipment.
 17. A screening device according to claim 16 wherein said frame includes a pair of tracks vertically spaced from one another, a lower of said tracks being elevated from said root by said support frame.
 18. A screening device according to claim 17 wherein said support frame includes a brace extending diagonally between said columns.
 19. A screening device according to claim 15 wherein said one panel slides relative to said form to uncover said one portion of said face.
 20. A screening device according to claim 19 wherein the other of said panels is fixed. 